7/8" x 1/4" N42 Countersunk Neodymium Disc Magnets – Rare Earth Magnets for #8 Flat Head Screws
Quick Facts
| Attribute |
Value |
| Magnet Type |
Neodymium Rare Earth Countersunk Disc Magnet |
| Grade |
N42 |
| Shape |
Disc with Countersunk Center Hole |
| Diameter |
7/8" (0.875" / 22.23 mm) |
| Thickness |
1/4" (0.250" / 6.35 mm) |
| Countersunk Hole |
0.355" x 0.195", 82° (Both Sides) |
| Compatible Screw |
#8 Flat Head Screw |
| Pull Force |
Over 20 lbs* |
| Material |
NdFeB (Neodymium-Iron-Boron) |
| Coating |
Nickel-Copper-Nickel (Ni-Cu-Ni) Triple Layer |
| Magnetization |
Through Thickness |
| Br Max |
13,200 Gauss |
| Certification |
ISO Certified |
*Note: Actual pull force may vary depending on the application, contact surface, steel thickness, and mounting method. Testing in your specific application is recommended.
Quick Answers
| Question |
Answer |
| How strong is this magnet? |
Approximately 20 lbs of pull force under ideal conditions. |
| What is this magnet made of? |
NdFeB (Neodymium-Iron-Boron) rare earth material. |
| Is N42 stronger than N35 magnets? |
Yes. N42 provides greater magnetic strength than N40, N38, and N35 magnets of the same size. |
| Can it be used outdoors? |
Yes, but additional sealing is recommended for long-term outdoor or humid environments. |
| What is it commonly used for? |
Cabinet doors, woodworking, magnetic fixtures, displays, equipment mounting, industrial applications, and DIY projects. |
Product Overview
These 7/8" x 1/4" N42 Countersunk Neodymium Disc Magnets combine powerful magnetic performance with the convenience of secure screw mounting. The 7/8-inch diameter provides a generous contact surface for dependable holding power, while the 1/4-inch thickness creates a deeper magnetic field than thinner disc magnets, making them ideal for permanent installations.
Each magnet features a 0.355" x 0.195" 82° countersunk hole on both sides, allowing installation with either magnetic pole facing outward. The countersunk design is compatible with standard #8 flat head screws, making these magnets perfect for woodworking, cabinetry, industrial fixtures, displays, and custom fabrication.
Manufactured from premium N42 grade NdFeB (Neodymium-Iron-Boron), these magnets deliver excellent magnetic strength and long-lasting reliability. A durable Nickel-Copper-Nickel (Ni-Cu-Ni) triple-layer coating provides superior resistance to corrosion, scratches, and chipping while maintaining a smooth, polished finish.
What Is a Countersunk Neodymium Disc Magnet?
A countersunk neodymium disc magnet is a permanent NdFeB (Neodymium-Iron-Boron) magnet with a precision-machined center hole designed to accept a flat head screw. This allows the magnet to be securely fastened to wood, metal, plastic, or composite materials without adhesives.
These magnets are magnetized through their thickness, placing the north and south poles on the two flat circular faces. The dual-sided countersunk hole allows either side of the magnet to face outward during installation, providing greater design flexibility.
Neodymium magnets are also commonly known as Neo magnets, NdFeB magnets, NIB magnets, or super magnets.
How Strong Is This Magnet?
This 7/8" x 1/4" N42 countersunk disc magnet provides over 20 pounds of pull force under ideal laboratory conditions using a thick, clean steel surface.
Actual holding force depends on several factors, including:
- Surface material
- Steel thickness
- Contact area
- Air gap
- Mounting method
- Environmental conditions
For maximum holding performance, mount the magnet securely and use it against a clean, flat steel surface.
Note: Pull force values are estimates based on ideal laboratory conditions. Actual performance should always be verified for your intended application.
Technical Specifications
| Specification |
Value |
| Magnet Type |
Neodymium Rare Earth Countersunk Disc Magnet |
| Grade |
N42 |
| Shape |
Disc with Countersunk Center Hole |
| Diameter |
7/8" (0.875" / 22.23 mm) |
| Thickness |
1/4" (0.250" / 6.35 mm) |
| Countersunk Hole |
0.355" x 0.195", 82° (Both Sides) |
| Compatible Screw |
#8 Flat Head Screw |
| Material |
NdFeB (Neodymium-Iron-Boron) |
| Coating |
Nickel-Copper-Nickel Triple Layer |
| Magnetization |
Through Thickness |
| Pull Force |
Over 20 lbs* |
| Br Max |
13,200 Gauss |
| Certification |
ISO Certified |
Nickel-Copper-Nickel Triple-Layer Coating
Every magnet features a Nickel-Copper-Nickel (Ni-Cu-Ni) triple-layer coating for superior durability and corrosion resistance.
Benefits
- Excellent scratch resistance
- Superior resistance to chipping and cracking
- Outstanding corrosion protection
- Smooth, polished metallic finish
- Long-lasting durability in industrial, commercial, and woodworking applications
Magnet Grade Comparison
| Grade |
Relative Strength |
Typical Applications |
| N35 |
Standard |
General-purpose magnets |
| N38 |
Moderate |
Consumer products |
| N40 |
High |
Industrial applications |
| N42 |
Higher |
Engineering, manufacturing, woodworking |
| N52 |
Maximum |
High-performance applications |
Disc Magnet Size Comparison
| Size |
Typical Use |
| Small |
Crafts and lightweight mounting |
| Medium |
General-purpose magnetic fixtures |
| 7/8" x 1/4" Countersunk |
Cabinetry, woodworking, industrial fixtures, equipment mounting |
| Large |
Heavy-duty industrial installations |
Applications by Industry
| Industry |
Common Uses |
| Manufacturing |
Magnetic fixtures and production equipment |
| Woodworking |
Cabinet doors, furniture, hidden magnetic catches |
| Construction |
Screw-mounted magnetic holders |
| Retail |
Displays, signage, exhibit fixtures |
| Industrial |
Equipment mounting and removable panels |
| DIY & Makers |
Workshop projects, custom builds, storage systems |
Common Questions About This Magnet
What is the pull force?
This magnet provides over 20 pounds of pull force under ideal testing conditions.
What size screw fits this magnet?
The 0.355" x 0.195" 82° countersunk hole is designed to fit a #8 flat head screw.
Why is the countersunk hole on both sides?
The dual-sided countersunk design allows either magnetic pole to face outward, providing greater flexibility during installation.
Is N42 stronger than N35 magnets?
Yes. N42 provides significantly greater magnetic strength and holding power than N35 magnets of the same dimensions.
Can this magnet rust?
The Nickel-Copper-Nickel triple-layer coating helps protect against corrosion. However, if the coating becomes damaged and the magnet is exposed to moisture, corrosion may occur over time.
Can it be used outdoors?
Yes. However, additional sealing is recommended for long-term outdoor or marine applications.
What direction is it magnetized?
This magnet is magnetized through its 1/4-inch thickness, with the north and south poles located on the two flat circular faces.
Do you offer bulk discounts?
Yes. Contact Super Magnet Store for wholesale pricing and volume discounts on large quantity orders.
Safety Notice: Neodymium magnets are extremely powerful and should be handled with care. Review all magnet safety guidelines before installation and use.
Why Buy From Super Magnet Store?
- Premium N42 NdFeB rare earth magnets
- ISO-certified quality
- High-strength N42 grade
- Dual-sided countersunk design for flexible installation
- Fits standard #8 flat head screws
- Durable Nickel-Copper-Nickel triple-layer coating
- Excellent corrosion resistance
- Consistent magnetic performance
- Precision manufacturing for reliable results
- Competitive wholesale pricing
- Bulk discounts available
- Trusted by manufacturers, woodworkers, engineers, and DIY professionals worldwide
